#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define DEBUG 0

int file_length(char *path)
{
	int file_len;
	FILE *fp = NULL;
	
	fp = fopen(path,"rb");
	fseek(fp,0,SEEK_END);
	if((file_len = ftell(fp)) < 1)
	{
		printf("文件为空\n");
	}
#if DEBUG
	printf("file_len=%d\n",file_len);
#endif
	fclose(fp);
	fp = NULL;
	return file_len;
}

char *file_read(char *path,int file_len)
{
	FILE *fp = NULL;
	char *pbuf;
	
	fp = fopen(path,"rb");
	pbuf = (char *) malloc(sizeof(char) * file_len);
	fseek(fp,0,SEEK_SET);
	fread(pbuf,sizeof(char),file_len,fp);
#if DEBUG
	int i;
	for(i=0;i<file_len;i++)
		printf("%d\n", *(pbuf + i));
	puts(pbuf);
#endif
	fclose(fp);
	fp = NULL;
	return pbuf;
}

int file_write(char *path,char *pbuf,int file_len)
{
	FILE *fp = NULL;
	fp = fopen(path,"wb");
	fwrite(pbuf,sizeof(char),file_len,fp);
	fclose(fp);
	fp = NULL;
	return 0;
}


int main(int argc, char *argv[])
{
	int file_len;
	char *pbuf = NULL;
	
	file_len = file_length(argv[1]);
	pbuf =  file_read(argv[1],file_len);
	file_write(argv[2],pbuf,file_len);
	
#if DEBUG
	printf("file_len=%d\n", file_len);
	int i;
	for(i=0;i<file_len;i++)
		printf("%d\n", *(pbuf + i));
	puts(pbuf);
#endif

	free(pbuf);
	return 0;
}
